12441198991 has 4 divisors (see below), whose sum is σ = 13398214312. Its totient is φ = 11484183672.

The previous prime is 12441198983. The next prime is 12441198997. The reversal of 12441198991 is 19989114421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19989114421 = 43973 ⋅454577.

It is not a de Polignac number, because 12441198991 - 2³ = 12441198983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12441198997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 478507641 + ... + 478507666.

It is an arithmetic number, because the mean of its divisors is an integer number (3349553578).

Almost surely, 2^12441198991 is an apocalyptic number.

12441198991 is a deficient number, since it is larger than the sum of its proper divisors (957015321).

12441198991 is an equidigital number, since it uses as much as digits as its factorization.

12441198991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957015320.

The product of its digits is 186624, while the sum is 49.

The spelling of 12441198991 in words is "twelve billion, four hundred forty-one million, one hundred ninety-eight thousand, nine hundred ninety-one".